Replies

1. Expert Member
   Malcolm Taylor|Sep 14, 2014 02:14pm|#1

   Craig, In general the only thing that limits how far the sill plate can be moved in is maintaining bearing for the floor joists. The reason for installing foam beyond the foundation is usually either that a) the design calls for the foam to extend down over the foundation exterior or b) the wall is too thick to have all its component parts bear on an 8" foundation. Your detail works fine.

2. 
   Lucas Durand - 7A|Sep 14, 2014 03:45pm|#2

   Craig,
   Have you considered extending the insulation down the exterior of the basement wall?
   Are you in termite country?

3. 
   Craig Harper|Sep 14, 2014 04:07pm|#3

   Thanks Malcolm - good to hear that I'm on the right track.

   Lucas, I did consider foam to the foundation footings, but we're not thrilled with the options to cover the exposed foam. We'd prefer some sort of stone/cultured stone, but being advised not to do that over foam. Yes, we do have termites....

   We're supposed to get back to our architect this week, so this key detail will determine our foundation plan. Any other variations of this wall assembly that I might not be thinking of?

   Thanks!
   Craig

4. 
   Lucas Durand - 7A|Sep 14, 2014 05:20pm|#4

   Craig,
   Like Malcolm, I think your detail is probably fine as long as it can dry to the inside...

   Stick with open cell foam if you intend to spray the inside of the rim board and no poly on the interior side of the stud walls.
   If you haven't already, consider taping the exterior sheathing as an air barrier.